Former Vikings defensive end Everson Griffen worked out for the team and was meeting with General Manager Rick Spielman before Wednesday's practice.
No deal had been reached as the team discussed it into the evening.
"I'm going to leave that to Rick," Vikings co-defensive coordinator Adam Zimmer said before practice. "I haven't really seen [Griffen], so he's up there meeting with those guys now. I'll let them handle that."
One of the more hotly contested camp battles is at right defensive end, where Stephen Weatherly and D.J. Wonnum are competing. Weatherly was the only player listed as a starter to play in last Saturday's 33-6 preseason opener loss to Denver.
"He played because there's a competition there," co-defensive coordinator Andre Patterson said. "So, to be fair, they both have to play."
Griffen, a 33-year-old right defensive end, played his first 10 seasons with the Vikings. He ranks fourth in team history in official sacks, with 74.5 of his 80.5 career sacks coming in Minnesota.
Griffen had an offer to return in 2020, but chose to sign a one-year deal with the Cowboys. He was later traded to the Lions and faced the Vikings in the season finale, notching one tackle for loss.
Barr: 'I've got some things I got to take care of'
Linebacker Anthony Barr missed practice again Wednesday.